Bulk Inhomogeneity

Bulk Inhomogeneity model allows you to find the dependence of optical parameters on the thickness of a thin film. The study of the bulk inhomogeneity in the first, so-called Schroeder's approximation, allows the determination of the degree of inhomogeneity of a thin film. More exact approximations allow investigating the refractive index profile of a thin film. See more in our publications.

Reflectance maxima (red) are shifted upwards from the bare substrate reflectance (black). It is known from the theory that such shifts are typical for thin films featuring bulk inhomogeneity.

Intermediate fitting, obtained after application of Cauchy model, is not good, especially in the regions of reflectance maxima. There is nothing strange, because the bulk inhomogeneity was not taken into account.

Final fitting, obtained after application of thin film model with bulk inhomogeneity. The degree of inhomogeneity is 1.6%.